Yuiga is a boy with shoulder-length black hair parted in the center, and slanted eyes with small pupils. When he is in trigger mode, he wears a black longcoat with thin red stripes on it and a Border emblem patch on his left sleeve, just like the rest of his unit.
Yuiga has a tremendous amount of pride in the fact that his unit is the top of the top, using it as a superiority of sort. He is cocky and smug; however, he is easily brought down by his teammates and his proud persona is easily blown. He is childish and whiny.
"Takeru" (尊,"Takeru"?) means "respect, revere, venerate, honor". "Yui" (唯,"Yui"?) means "only, yes", while "wa" (我,"wa"?) means "our, us, I, me, my, we". Together, it can mean "respect only to myself", which describes his personality and attitude.
He likes high-class French cuisine and being respected.
Additionally, he bears a resemblance to Tadashi Yuiga.
According to Border Briefing File, Yuiga is both Border's least popular and the most concerned with popularity, while Raijinmaru is both the most popular and the least concerned with popularity.